678338915 has 4 divisors (see below), whose sum is σ = 814006704. Its totient is φ = 542671128.

The previous prime is 678338861. The next prime is 678338917. The reversal of 678338915 is 519833876.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678338915 - 2¹⁴ = 678322531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678338917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67833887 + ... + 67833896.

It is an arithmetic number, because the mean of its divisors is an integer number (203501676).

Almost surely, 2^678338915 is an apocalyptic number.

678338915 is a deficient number, since it is larger than the sum of its proper divisors (135667789).

678338915 is a wasteful number, since it uses less digits than its factorization.

678338915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135667788.

The product of its digits is 1088640, while the sum is 50.

The square root of 678338915 is about 26044.9402955737. The cubic root of 678338915 is about 878.6493204282.

The spelling of 678338915 in words is "six hundred seventy-eight million, three hundred thirty-eight thousand, nine hundred fifteen".